session destroy and unset code example

Example 1: unset session in php

session_unset();    //Destrol all session variables

Example 2: destroy session php

<?php 
 session_start(); // start session
 session_destroy();  // Delete whole session
// OR
unset($_SESSION['username']); // delete any specific session only
?>

Example 3: php session destroy

<?php
// Destroy the currently active session.
session_destroy();
?>